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- Title
Roles of Alkaline Earth Ions in Garnet-Type Superionic Conductors.
- Authors
Song, Shufeng; Kotobuki, Masashi; Zheng, Feng; Xu, Chaohe; Wang, Yu; Li, Wei Dong Z.; Hu, Ning; Lu, Li
- Abstract
The roles of alkaline earth ions in garnet-type superionic conductors Li7.1La3Zr1.95M0.05O12 (M=Mg, Sr, Ba) are further investigated. In contrast to previous reports, the alkaline earth ions are specifically allocated to the octahedral sites (Zr4+ sites) instead of dodecahedral sites (La3+ sites) in the present work. The alkaline-earth-ion-doped Li7.1La3Zr1.95M0.05O12 garnets exhibit enhanced room-temperature conductivities with the increasing ionic radii of alkaline-earth ions. Ba-doped Li7.1La3Zr1.95Ba0.05O12 provides the highest conductivity of 1.13×10−3 S cm−1 at room temperature, whereas Mg- and Sr-doped garnets show conductivities of 4.32×10−4 and 8.91×10−4 S cm−1 at room temperature, respectively. The obtained ionic conductivities are comparable to other promising superionic conductors that are already known. Moreover, the alkaline-earth-ion-doped garnets demonstrate a wide electrochemical stability window of 9 V vs. Li/Li+, and stability against metallic lithium by means of symmetric galvanostatic cycling.
- Subjects
SUPERIONIC conductors; ALKALINE earth metals; GARNET; FERRIMAGNETIC materials; ELECTRICAL conductors
- Publication
ChemElectroChem, 2017, Vol 4, Issue 2, p266
- ISSN
2196-0216
- Publication type
Article
- DOI
10.1002/celc.201600639